Update docker/build-push-action action to v7

Author: renovate[bot]

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
         with:
           images: ghcr.io/cego/swarm-app
           tags: type=semver,pattern={{version}}
-      - uses: docker/build-push-action@v6
+      - uses: docker/build-push-action@v7
         with:
           platforms: linux/amd64,linux/arm64
           push: true